>>300694/jp/ was originally a containment board for touhou since /v/ didn't want the touhou games discussed there and /a/ didn't want touhuo doujin discussed there
general japanese topics were added to ensure /jp/ had enough content to keep the board alive
later it became otaku culture to allow k-pop, k-drama, and light novels since /tv/, /lit/, and /a/ didn't want it on their boards
for the most part /jp/ in a general dumping ground for anything the other boards don't want
